package com.yh.correct.shiro;

import java.security.MessageDigest;

/**
 * Created by Administrator on 2017/8/14.
 */
public class MD5andKL {
    // MD5加码。32位
    public static String MD5(String inStr) {
        MessageDigest md5 = null;
        try {
            md5 =MessageDigest.getInstance("MD5");
        } catch (Exception e) {
            System.out.println(e.toString());
            e.printStackTrace();
            return"";
        }
        char[] charArray =inStr.toCharArray();
        byte[] byteArray = new byte[charArray.length];
        for (int i = 0; i< charArray.length; i++)
            byteArray[i]= (byte) charArray[i];
        byte[] md5Bytes =md5.digest(byteArray);
        StringBuffer hexValue = new StringBuffer();
        for (int i = 0; i< md5Bytes.length; i++) {
            int val =((int) md5Bytes[i]) & 0xff;
            if (val< 16)
                hexValue.append("0");
            hexValue.append(Integer.toHexString(val));
        }
        return hexValue.toString();
    }
    // 可逆的加密算法
    public static String KL(String inStr) {
        // String s = newString(inStr);
        char[] a =inStr.toCharArray();
        for (int i = 0; i< a.length; i++) {
            a[i] = (char)(a[i] ^ 't');
        }
        String s = new String(a);
        return s;
    }

    // 加密后解密
    public static String JM(String inStr) {
        char[] a =inStr.toCharArray();
        for (int i = 0; i< a.length; i++) {
            a[i] = (char)(a[i] ^ 't');
        }
        String k = new String(a);
        return k;
    }

    // 测试主函数
    public static void main(String args[]) {
        String s = new String("admin");
        System.out.println("原始：" +s);
        System.out.println("MD5后：" +MD5(s));
        System.out.println("MD5后再加密：" +KL(MD5(s)));
        System.out.println("解密为MD5后的："+ JM(KL(MD5(s))));
    }

}
